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# L2 Forces, Mass, Acceleration, Pressure, Review of Exponents - PowerPoint PPT Presentation

L2 Forces, Mass, Acceleration, Pressure, Review of Exponents. Frictionless motion Demo. 5. NEWTON’S FIRST LAW OF MOTION. Newton finished the overthrow of Aristotelian ideas. Law 1 (Law of Inertia)

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L2 Forces, Mass, Acceleration, Pressure, Review of Exponents

Newton finished the overthrow of Aristotelian ideas.

Law 1 (Law of Inertia)

Every object continues in its state of rest, or of uniform motion in a straight line, unless it is compelled to change that state by forces impressed upon it.

“If you leave an object alone, it has constant velocity.”

(a) constant velocity

(b) constant acceleration

(c) constant net force

Inertial mass object was

We call the change in velocity per unit time the accelerationa= Δv/ ΔtThe Δv can be in magnitude and/or direction

(Only the net force is shown in the figures on this slide.)

m

m

m

This symbol means

proportional to

FORCE CAUSES ACCELERATION

F

a

F

a

F

a

The acceleration of an object is directly proportional to the net force.

• The force in each of these equations represents the vector sum of all of the forces acting on the object of mass m.

• Units of force - N and lb

or

slug) force.

A slug weighs

Every object possesses inertia (mass).

Inertia is the sluggishness of an object to changes in its state of motion.

Mass - a measure of the inertia of an object

(Units - kg and

3. MASS AND WEIGHT

32 lb.

• Inertia deals with how hard it is to start and stop an object.

m force.1

m2

r

Newton's Law of Universal Gravitation

At earth’s surface, force.F = G mMe/Re2 orW = (Gme/Re2) m or W=(g)m orweight = mass x acceleration of gravityg = 9.8 m/s2

A 2 kg mass weighs: force.A) 2 NB) 19.6 NC) 32 ND) 105 NE) Not enough information given

2 Concepts of Mass: force.Equivalence of gravitational mass and Inertial massTheory of General relativity

Pressure=Force/contact area force.On left, the pressure on the bottom block, i.e. the weight of the top block/contact area, is lower than the pressure on the bottom block on the right.

1000 = 10 x 10 x 10 = 10 force.3

100 = 10 x 10 = 102

10 = 101

1 = 100

0.1 = 1/10 = 10-1

0.01 = 1/100 = 10-2

0.001 = 1/1000 = 10-3

For CAPA, we write force.356 as 3.56E2

10 force.-2 x 10+6 = 10410-2/106 = 10-8